A recent study led by researchers at the Institute of Plant Genetics, Department of Molecular Plant Breeding, Leibnez University Hannover, Germany demonstrates how PACE® genotyping can be used to robustly validate marker–trait associations in genetically complex, polyploid crops such as ornamental roses.
Modern plant breeding increasingly relies on molecular markers to reduce time, cost and uncertainty, particularly when working with genetically complex, polyploid species. A recent study published in Frontiers in Plant Science demonstrates how PACE® genotyping technology can play a critical role in validating marker–trait associations identified through genome-wide association studies (GWAS) in ornamental roses.
The challenge: breeding precision in polyploid roses
Roses are among the world’s most economically important ornamental crops, but their genetics present a significant challenge to breeders. Most cultivated roses are autotetraploid, meaning they carry four copies of each chromosome. This genetic complexity complicates both trait inheritance and marker analysis, particularly for quantitative traits such as:
- Flower fragrance
- Petal number and length
- Leaf glossiness
- Prickle density
- Anthocyanin coloration
While GWAS has become a powerful discovery tool, independent marker validation remains essential, especially when associations are intended for marker-assisted selection (MAS) in breeding programmes.
The study: GWAS followed by independent PACE® validation
In the study “Beyond bloom: validated marker–trait discovery for polyploid roses via GWAS”, researchers analysed 285 rose cultivars using a high-density SNP array and identified significant marker–trait associations across nine ornamental traits
Crucially, the team then moved beyond discovery by validating selected SNP markers in independent rose panels (up to 190 additional genotypes) using PACE allele-specific PCR assays. This two-step approach ensured that marker effects were:
- Suitable for practical breeding applications
- Reproducible across environments
- Detectable in new genetic backgrounds
Why PACE was chosen for validation
PACE genotyping was used as an alternative marker technology to SNP arrays for single-marker validation. In the paper, the authors highlight several practical advantages:
- Robust allele-specific detection suitable for polyploid dosage analysis
- Cost-effective genotyping, enabling larger validation panels
- High-throughput compatibility using standard real-time PCR platforms
- Flexibility to test multiple markers without probe redesign
Using PACE, the researchers successfully validated 26 SNP markers across six key ornamental traits of high commercial relevance to rose breeders, including flower fragrance, petal number, petal length and leaf glossiness.
Demonstrating marker robustness across traits
The study showed particularly strong validation outcomes for:
- Flower number of petals, where several newly developed markers outperformed previously published reference markers
- Flower fragrance, where multiple loci showed consistent, moderate-to-large effect sizes across panels
- Leaf glossiness, where PACE-validated markers showed even stronger effects in the validation population than in the original GWAS
These results underline the value of PACE as a reliable downstream validation tool, supporting confident translation of GWAS discoveries into breeding decisions.
From discovery to application: supporting marker-assisted selection
Importantly, the authors note that their PACE-based validation strategy supports the robustness of marker–trait associations despite limited panel sizes, a common constraint in specialty crops and ornamentals
This reinforces a broader point for plant breeders and geneticists:
- GWAS discoveries only become useful when markers can be validated, deployed and trusted in real breeding populations.
- PACE enables exactly this transition, from discovery science to applied breeding, without the cost or complexity barriers often associated with probe-based genotyping methods
Making science affordable without compromising quality
This study exemplifies how affordable, flexible genotyping chemistry can support high-quality research in complex genomes. By using PACE for independent marker validation, the researchers were able to expand their analyses, strengthen confidence in their findings and deliver markers with genuine breeding value.
Ready to accelerate your trait discovery and validation?
If you are working to identify, validate, or deploy genetic markers for complex traits, whether in ornamentals, crops or other polyploid species, 3CR can help.
PACE genotyping provides a cost-effective, flexible, and scalable route from marker discovery to practical application, supporting everything from GWAS validation and trait confirmation through to marker-assisted selection in breeding programmes.
Our team works closely with researchers and breeders to:
- Convert SNPs into robust PACE assays
- Validate markers in independent populations
- Scale genotyping without the cost or constraints of probe-based systems
If you’d like to explore how PACE could support your research or breeding goals, we’d be happy to discuss your project.
Contact 3CR to talk to our team about how PACE can help advance your research.
